Hello.
Could you help me with LEAK DETECTED error while minor compaction process?
There is a table with a lot of small record 6.6*10^9 (mapping
(eventId, boxId) -> cellId)).
Minor compaction starts and then fails on 99% done with an error:
Stacktrace
ERROR [Reference-Reaper:1] 2018-02-05 10:06:17,032 Ref.java:207 - LEAK
DETECTED: a reference
(org.apache.cassandra.utils.concurrent.Ref$State@1ca1bf87) to class
org.apache.cassandra.io.util.MmappedSegmentedFile$Cleanup@308695651:/storage1/cassandra_events/data/EventsKeyspace/PerBoxEventSeriesEvents-41847c3049a211e6af50b9221207cca8/tmplink-lb-102593-big-Index.db
was not released before the reference was garbage collected
ERROR [Reference-Reaper:1] 2018-02-05 10:06:17,033 Ref.java:207 - LEAK
DETECTED: a reference
(org.apache.cassandra.utils.concurrent.Ref$State@1659d4f7) to class
org.apache.cassandra.utils.concurrent.WrappedSharedCloseable$1@1398495320:[Memory@[0..dc),
Memory@[0..898)] was not released before the reference was garbage
collected
ERROR [Reference-Reaper:1] 2018-02-05 10:06:17,033 Ref.java:207 - LEAK
DETECTED: a reference
(org.apache.cassandra.utils.concurrent.Ref$State@42978833) to class
org.apache.cassandra.utils.concurrent.WrappedSharedCloseable$1@1648504648:[[OffHeapBitSet]]
was not released before the reference was garbage collected
ERROR [Reference-Reaper:1] 2018-02-05 10:06:17,033 Ref.java:207 - LEAK
DETECTED: a reference
(org.apache.cassandra.utils.concurrent.Ref$State@3a64a19b) to class
org.apache.cassandra.io.sstable.format.SSTableReader$DescriptorTypeTidy@863282967:/storage1/cassandra_events/data/EventsKeyspace/PerBoxEventSeriesEvents-41847c3049a211e6af50b9221207cca8/tmplink-lb-102593-big
was not released before the reference was garbage collected
ERROR [Reference-Reaper:1] 2018-02-05 10:06:17,033 Ref.java:207 - LEAK
DETECTED: a reference
(org.apache.cassandra.utils.concurrent.Ref$State@4ddc775a) to class
org.apache.cassandra.io.util.CompressedPoolingSegmentedFile$Cleanup@1041709510:/storage1/cassandra_events/data/EventsKeyspace/PerBoxEventSeriesEvents-41847c3049a211e6af50b9221207cca8/tmplink-lb-102593-big-Data.db
was not released before the reference was garbage collected
I have tried increase max heap size (8GB -> 16GB), but got the same error.
How can I resolve the issue?
Cassandra parameters and the problem table
Cassandra v 2.2.9
MAX_HEAP_SIZE="16G"
java version "1.8.0_121"
compaction = {'min_threshold': '4', 'enabled': 'True', 'class':
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32'}
compression = {'sstable_compression':
'org.apache.cassandra.io.compress.SnappyCompressor'}
nodetoole tablestats
Read Count: 1454605
Read Latency: 2.0174777647540054 ms.
Write Count: 12034909
Write Latency: 0.044917336558174224 ms.
Pending Flushes: 0
Table: PerBoxEventSeriesEventIds
SSTable count: 20
Space used (live): 885969527458
Space used (total): 885981801994
Space used by snapshots (total): 0
Off heap memory used (total): 19706226232
SSTable Compression Ratio: 0.5722091068132875
Number of keys (estimate): 6614724684
Memtable cell count: 375796
Memtable data size: 31073510
Memtable off heap memory used: 0
Memtable switch count: 30
Local read count: 1454605
Local read latency: NaN ms
Local write count: 12034909
Local write latency: NaN ms
Pending flushes: 0
Bloom filter false positives: 0
Bloom filter false ratio: 0.00000
Bloom filter space used: -4075791744
Bloom filter off heap memory used: 17399044576
Index summary off heap memory used: 2091833184
Compression metadata off heap memory used: 215348472
Compacted partition minimum bytes: 104
Compacted partition maximum bytes: 149
Compacted partition mean bytes: 149
Average live cells per slice (last five minutes): NaN
Maximum live cells per slice (last five minutes): 0
Average tombstones per slice (last five minutes): NaN
Maximum tombstones per slice (last five minutes): 0
Thank You
Darya Melentsova
email: ifire...@gmail.com
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